Visualization Tools

Dipitiy (timeline tool)

Many Eyes (upload data choose graphic representation)

Google Chart Tools (tools for making data more comprehensible)

Review & calculate your opinion-- Yelp / Gobi

Bubbl.us - Brainstorming made simple

Free Mind (open source mind mapping software)

Gap Minder (beauty of statistics for a fact based world view).
Visuwords - online graphical dictionary

Tinkerplots (Gr 4-8 making sense of data) - need to purchase

Wordle (visual representation through words)